A.X-K2 vs Solar Open2 250B
Wins 1 of 5 areas
Reasoning
Wins 4 of 5 areas
Coding · Agents · Facts · Long documents
Solar Open2 250B is the stronger all-rounder.A.X-K2 is better at reasoning.
Scores updated · 14 tests both models report · How we compare
Where each one wins
Tests won in each of the five areas where both have results. Each piece is one test, so a longer bar means more evidence; grey means the two scored within a point of each other.
- CodingWriting and fixing software02Solar Open2 250B2 of 2 tests
- AgentsCarrying out multi-step tasks on its own02Solar Open2 250B2 of 2 tests
- FactsGetting facts right instead of making them up01Solar Open2 250B1 of 2 tests · 1 tie
- Long documentsFinding answers in very long texts01Solar Open2 250B1 of 1 test
- ReasoningHard problems that need careful thinking20A.X-K22 of 3 tests · 1 tie
Long documents rests on a single test.
The biggest differences
The tests each model wins by the widest margin, up to three each. Scores are out of 100.
Where Solar Open2 250B pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+7.6points ahead
- Code for real scientific research problemsSciCode+7points ahead
- Customer-service tasks in a simulated bankτ-Bench V3 · Banking+5.5points ahead
Where A.X-K2 pulls ahead
- Research-level physics problemsCritPt+3.2points ahead
- Very hard expert questions across many subjectsHumanity's Last Exam+1.1points ahead
Every test, side by side
All 14 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingSolar Open2 250B
- SciCodeSolar Open2 250B by 74148+7
- Terminal-Bench 2.1Solar Open2 250B by 5.23944.2+5.2
AgentsSolar Open2 250B
- τ-Bench V3 · BankingSolar Open2 250B by 5.516.121.6+5.5
- GDPValSolar Open2 250B by 4.423.227.6+4.4
ReasoningA.X-K2
- CritPtA.X-K2 by 3.28.95.7+3.2
- Humanity's Last ExamA.X-K2 by 1.129.628.5+1.1
- GPQA Diamondtie85.785.7tie
FactsSolar Open2 250B
- AA-Omniscience · Non-hallucinationSolar Open2 250B by 7.66774.6+7.6
- AA-Omniscience · Accuracytie18.618.8tie
Other results4 tests, not counted
Tests outside the eight areas. They are not counted above: several are summary scores built from other tests, or the same test under another name.
- AA-OmniscienceSolar Open2 250B by 6.4-8.2-1.8+6.4
- Artificial Analysis Coding IndexSolar Open2 250B by 6.238.845+6.2
- AA IntelligenceSolar Open2 250B by 3.221.524.7+3.2
- AA Agentic IndexSolar Open2 250B by 2.125.727.8+2.1
Questions people ask
Which is better, A.X-K2 or Solar Open2 250B?
Solar Open2 250B wins four of the five areas where both have results: coding, agents, facts and long documents. A.X-K2 wins reasoning.
Which is better for coding?
Solar Open2 250B. It wins 2 of the 2 coding tests both models report; A.X-K2 wins none.
How do you compare the two?
We use the 14 benchmark tests both models have published scores on. The verdict counts the 10 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 4 are listed but not counted, because several are summary scores or repeat a test. Each score is the one shown on the model's own page.